Automatic safety check valve



c. H. man. AUTOMATIC SAFETY CHECK VALVE.

APPLICATION FILED MAYSI. I92I.

1,43*?, 1 36, I Patented Nov. 2s, 1922.

Patented Nov. Z8, 19.22.

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eAiaN'r oFFlcE.

CHARLES H. '.EREEB), OF LOSANGELES, CALIFORNIA.

AUTOMATIC `SAFETY CHECK VALVE` Application filed May, 31,

T 0 all whom t may oncern Be it knoWn that I, CHARLES H. FREEIua 'citizenof the United States, residing inthe city and county of Los Angeles and State of California, have invented a new and useful Automatic Safety Check Valve, of which thefollowing is a specification.y

This invention has relationk to. an improved check-valve, and has for its objects` the provision of means for attaching the de-I vice to a water-gauge, means for automatically effecting a vclosure when the water-gauge isr blown off, or removed, and means for manually effecting the closure ofthe valve when 'the water gauge is to be removed, l

This invention consists inthe combination with the stopple or check-valve member,rof means for effecting a union with a water-gauge, means for closing the valve manually, and a drain-cock for draining` the valve body when the manually operated valve element is shifted to the closed position.

Other objects are to prevent danger from scalding when the water-gauge is `broken or blown olf, and to effectually close the valve when desired. Y

In the drawings, Figure 1 is a side view of the valve, with the upper part in section. Fig. 2 is a detail view of the guide for the check valve stem, and stop for the valve. Fig. 3 is a detail view of the combined valve stem guide memberl and abutment for the spring. Fig. 4 is a detail view of the valve member. Fig. 5 is an end elevation of my improved device.

Referring to the drawings, the invention consists in a device havingthe body 11 and water chamber 12, thebody having the eX- tension 13, on which screws the cap 14, to form n a union with the water-glass (not shown). One end 15 is threaded toreceive the cap 16, and is countersunk to receive the packing 17 A packing gland 18 screws into the cap 16, and retains the packing 19, around the valve stem 20, which is in threaded engagementl with the cap 16. The valvestem 20 is provided with a hand-wheel 21, for manual manipulation thereof and on the opposite end with a head 22, chamfered to engage with the valve seat 23, in chamber 12. The end 24, of the body is recessed and threaded to receive the check-valve body 25,

` which is vprovided with a threaded end 26,

adapted to screw into a boiler. 1n the recess 27 is mounted the valve-stem guide 1921. Serial No. 473,663.v

and spring yabutment 28, which is retained.y by the packing element 29, interpo`sedebe--` tween the guide28 and chGCk-Valve body 25 The.` outer ,valve guide 30, yis secured by` screws 41 to valve body 25. The valve member 31integral with thekvalve stem32 and valve stem 33, is adapted to engage with valve yseat'3'4, in member 25. A spring 35, encirclin valve stem 32, and interposed between va ve stem guide 28andvalve kmember 31,. serves to maintain 'the checky valve normally in the open'position. The-'drain cock 36 is provided for emptying the' chambei-,12, prior to removing thev Water-glass.

In use, the part or check valve body 25 is screwed into the boiler, and the watereglass is attached to the extension 13, by the union collar 14, having. the opening 38. The partsy are normally in the position shown in Fig. 1, and the chamber 12 is filled with steam or water in accordance with the location of the device. Should the water-glass be broken or blown ofl", the steam or Water rushing through the ports 39 in guide 30, and ports 40, in guide 28, acts upon the valve member 31 and forces the same into the vvalve seat 34. The `steam pressure therefore immediately closes the communication with the chamber 12. The water-glass may be then replaced, and the hand wheel 21 is then turned so that the head 22 engages with the valve stem 32, to open valve 31 from the valve seat 34, whereupon'the pressure in chamber 12 is equalized with the boiler pressure and valve member 31 is retained by the spring 35 in open position.

By the use of the above-described device, absolute safety is assured to the operator in case of accident to the water-glass, and at the same time an efficient means is provided for closing the boiler opening, to replace the water-glass.

be retained in closed position when the `water glass has been broken or removed, or

Vuntil released by the closing of the valve As long as there is pressure in the boiler, the valve member 31 willl jecting 'from the easing of the body, a handwheel to operate they valve disk, a sleeve member having screw connection with the valve body on the inlet side of said valve seat, a guide member mounted in the end of the sleeve member, and having ports of communieation, a guide member at the opposite end of the sleeve member and retained in position by the sleeve member, said sleeve member having a valve seat mid-way between the guide members, a valve'element adapted to eoaet with the valve seat in the ksleeve member to close the passage way therein, valve stems integral with the valve element and sliding in said guide members, and a spring interposed between the valve element and the inner guide member.

2. In a valve, the combination with a valve casing, having al water chamber, a drain cock for thewater Chamber, a valve seat in one end of the water chamber, a valve disk to coaet with said valve seat, a

n union sleeve at the top of the Water chamber, a threaded valve stem to aotuate said valve disk, and a hand-wheel on the valve stem, of a sleeve member forming a lateral extension to the valve body on the inlet `side of the valveseat, guide members et opposite ends of the sleeve member, said sleeve member having a valve seat between the gul-de members, a valve element arranged to co-aet with the lastnamed valve seat, valve stems integral with the valve element and sliding in said guide members, and a spring interposed between the inner guide member and the valve element.

3. The Combination with a valve body havin@ a water chamber, a valve port arn 'rangec with a valve seat, a valve disk to co-aet with the valve seat, a valve stem and hand wheel for manipulating the valve disk, a top extension, and a union sleeve engaging the top extension, of a sleeve forming a lateral extension tothe valve body on the inlet side of the valve seat and having a passage way therein, and a valve seat in the passage way, guide members at the ends of the sleeve, a valve member sliding in said guide members and havinga head adapted to vengage with said last-named valve seat and a spring interposed between the inner guide member, and the valve head.

In testimony whereof, I hereto ailX my signature.

CHARLES H. FREER. 

